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摘要 :
Nano-zero-valent iron (nZVI), as a typical nano-material, has been recently used in wastewater treatment and combination with bioreactors. Using nZVI coupled denitrification system research the effect and influence of nZVI enhanced denitrification sludge on the degradation of toxic compounds and system performance. The nZVI coupled denitrification system showed better resistance to 2,6-DCP impact, and the concentrations of effluent NO2- and NO3- were below 2.0 mg/L. At the same time, the addition of nZVI enabled the denitrification system to quickly adapt to the toxic environment of 2,6-DCP within 15 days, and the degradation efficiency of 2,6-DCP reached 99.9%. The released SMP reduced after nZVI coupled with denitrification sludge in 2,6-DCP environment, which could improve the effluent water quality. Nuclear magnetic resonance spectroscopy showed that the addition of nZVI would change the structure of EPS in denitrification sludge. After 90 days of operation, the dominant bacteria in the denitrifying sludge have undergone great changes. Moreover, Thauera was responsible as the dominant bacteria for degrading 2,6-DCP in the denitrification system. The increased in the proportion of functional bacteria with nitrate_reduction, nitrogen_respiration, nitrate_respiration and nitrite_respiration in the presence of NZVI further reveals the mechanism of enhanced denitrification.
关键词 :
2,6-dichlorophenol 2,6-dichlorophenol Denitrification Denitrification Microbial structure Microbial structure Molecular weight Molecular weight Nano-zero-valent iron Nano-zero-valent iron
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GB/T 7714 | Li, Mingrun , Wei, Dong , Zhang, Zhaoran et al. Enhancing 2,6-dichlorophenol degradation and nitrate removal in the nano-zero-valent iron (nZVI) solid-phase denitrification system [J]. | CHEMOSPHERE , 2022 , 287 . |
MLA | Li, Mingrun et al. "Enhancing 2,6-dichlorophenol degradation and nitrate removal in the nano-zero-valent iron (nZVI) solid-phase denitrification system" . | CHEMOSPHERE 287 (2022) . |
APA | Li, Mingrun , Wei, Dong , Zhang, Zhaoran , Fan, Dawei , Du, Bin , Zeng, Huiping et al. Enhancing 2,6-dichlorophenol degradation and nitrate removal in the nano-zero-valent iron (nZVI) solid-phase denitrification system . | CHEMOSPHERE , 2022 , 287 . |
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摘要 :
In the presence of organic matter, the granular anammox system under sequencing batch mode showed more robust anammox performance than that under completely mixed mode, which was attributed to the better biomass retention with high settling ability and stability of granular sludge. Based on the specific anammox activity test, stratified and mixed distribution of heterotrophic bacteria was found under completely mixed and sequencing batch mode, respectively. The stratified microbial distribution resulted in low enzyme activity of anammox bacteria and sludge disintegration by hindering substrate transfer with a large accumulation of EPS on the granular surface. Whereas the heterotrophic bacteria mixed in granules (mixed microbial distribution) act as a "skeleton", which increased the particle size, density, and stability of granular sludge. Compared with biokinetic-based selection, diffusion-based selection with high substrate penetration depth more likely resulted in the mixed granular structure and strong resistance to organic inhibition under sequencing batch mode.
关键词 :
Bio-kinetic selection Bio-kinetic selection Diffusion-based selection Diffusion-based selection Mixotrophic anammox granule Mixotrophic anammox granule Operational mode Operational mode Spatial growth distribution Spatial growth distribution
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GB/T 7714 | Li, Dong , Wei, Ziqing , Li, Shuai et al. Operational mode affects the role of organic matter in granular anammox process [J]. | BIORESOURCE TECHNOLOGY , 2021 , 336 . |
MLA | Li, Dong et al. "Operational mode affects the role of organic matter in granular anammox process" . | BIORESOURCE TECHNOLOGY 336 (2021) . |
APA | Li, Dong , Wei, Ziqing , Li, Shuai , Wang, Wenqiang , Zeng, Huiping , Zhang, Jie . Operational mode affects the role of organic matter in granular anammox process . | BIORESOURCE TECHNOLOGY , 2021 , 336 . |
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摘要 :
Hollow anaerobic ammonium oxidation (Anammox) granular sludge formed and became the main part in the treatment of low-strength ammonia wastewater. The characteristics and formation mechanism of hollow Anammox granular sludge were investigated in a continuous stirred tank reactor (CSTR) at room temperature. Granular sludge was found to be cavitated, and Candidatus Kuenenia was the dominant bacteria that lived and coexisted with other bacteria in walls under an extracellular polymeric substance (EPS) shield. The EEMPARAFAC analysis was applied to characterize the EPS, while EPS secretion was the expression of specific Anammox activity. Tryptophan or protein-like was the active component of proteins (PN) as the main part of EPS in granules. These results confirm that hollow Anammox granular sludge is suitable for low-strength ammonia sewage. Finally, a conceptual model of hollow Anammox granules growth and breakage was developed, and cavitation was a key step of regranulation.
关键词 :
Anammox Anammox Extracellular polymer substance Extracellular polymer substance Hollow granules Hollow granules Low-strength ammonia Low-strength ammonia
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GB/T 7714 | Wang, Wenqiang , Li, Dong , Li, Shuai et al. Characteristics and formation mechanism of hollow Anammox granular sludge in low-strength ammonia sewage treatment [J]. | CHEMICAL ENGINEERING JOURNAL , 2021 , 421 . |
MLA | Wang, Wenqiang et al. "Characteristics and formation mechanism of hollow Anammox granular sludge in low-strength ammonia sewage treatment" . | CHEMICAL ENGINEERING JOURNAL 421 (2021) . |
APA | Wang, Wenqiang , Li, Dong , Li, Shuai , Zeng, Huiping , Zhang, Jie . Characteristics and formation mechanism of hollow Anammox granular sludge in low-strength ammonia sewage treatment . | CHEMICAL ENGINEERING JOURNAL , 2021 , 421 . |
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摘要 :
In this experiment, the effects of different stirring methods on the rejuvenation and operation of anaerobic ammonium oxidation sludge under normal temperature (21±1) conditions were investigated. Three groups of reactors (R1, R2, and R3) were studied, and the stirring methods were continuous stirring for R1 and intermittent stirring with different rotation speeds for R2 and R3. The denitrification performance and the performance of granular sludge during system rejuvenation and operation process were analyzed. Results show that the removal rates of ammonia nitrogen and nitrite nitrogen of R1, R2, and R3 were close to 100% in 10, 2 and 2 d, respectively. The anaerobic ammonium oxidation rates of R2 and R3 were higher, which were more suitable for the growth of anammox bacteria. According to the results of cycle test, the fluidization state of the water flow formed by the intermittent stirring method was weak, so that the reactor had lower dissolved oxygen for a longer period, and it was easier to inhibit the activity of AOB, thereby increasing the activity of the anammox bacteria. The R1 system provided strong shearing force and had continuous contact with the substrate solution, resulting in more EPS. At the end of the static operation phase, the average particle size of granular sludge in R1, R2, and R3 was 723, 675 and 649 μm, respectively. Copyright ©2021 Journal of Harbin Institute of Technology.All rights reserved.
关键词 :
Ammonia Ammonia Bacteria Bacteria Dissolved oxygen Dissolved oxygen Endocrinology Endocrinology Flow of water Flow of water Fluidization Fluidization Granular materials Granular materials Nitrogen Nitrogen Nitrogen removal Nitrogen removal Oxidation Oxidation Particle size Particle size Wastewater treatment Wastewater treatment
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GB/T 7714 | Li, Dong , Cao, Zhengmei , Zhang, Jie et al. Effect of different stirring methods on rejuvenation and operation of anaerobic ammonium oxidation sludge [J]. | Journal of Harbin Institute of Technology , 2021 , 53 (5) : 1-8 . |
MLA | Li, Dong et al. "Effect of different stirring methods on rejuvenation and operation of anaerobic ammonium oxidation sludge" . | Journal of Harbin Institute of Technology 53 . 5 (2021) : 1-8 . |
APA | Li, Dong , Cao, Zhengmei , Zhang, Jie , Zhang, Shirui , Li, Shuai . Effect of different stirring methods on rejuvenation and operation of anaerobic ammonium oxidation sludge . | Journal of Harbin Institute of Technology , 2021 , 53 (5) , 1-8 . |
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摘要 :
While many studies have successfully used plant extracts to biosynthesize iron nanoparticles as low-cost, sustainable and high-performance materials for removing Cr(VI) from aqueous solution, the exact removal mechanism involved remains poorly understood. In this research, a green tea extract was employed both as a reducing and coating agent to prepare iron nanoparticles (GT-nFe) via an environmentally friendly green synthesis method, where the material so produced was then used to remove Cr(VI) from aqueous solution. The efficiency in removing Cr(VI) using GT-nFe reached 90.2 % at an initial Cr(VI) concentration of 60mgL−1 and pH of 5.0. Kinetic and thermodynamic analysis indicated that Langmuir isotherm and pseudo-second order models best described the adsorption of Cr(VI) by GT-nFe. Thermodynamic studies revealed that adsorption was spontaneous (ΔG00>0). Application of advanced characterization techniques, including SEM-EDS, TEM and XPS, indicated a detailed Cr(VI) removal mechanism involving both adsorption and redox reactions. © 2021 Elsevier B.V.
关键词 :
Adsorption Adsorption Biochemistry Biochemistry Chemicals removal (water treatment) Chemicals removal (water treatment) Chromium compounds Chromium compounds Chromium metallography Chromium metallography Extraction Extraction Green Synthesis Green Synthesis Iron Iron Iron compounds Iron compounds Iron research Iron research Isotherms Isotherms Nanoparticles Nanoparticles Plant extracts Plant extracts Redox reactions Redox reactions Tea Tea Thermoanalysis Thermoanalysis Thermodynamic properties Thermodynamic properties
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GB/T 7714 | Hao, Runqin , Li, Dong , Zhang, Jie . Insights into the removal of Cr(VI) from aqueous solution using plant-mediated biosynthesis of iron nanoparticles [J]. | Environmental Technology and Innovation , 2021 , 23 . |
MLA | Hao, Runqin et al. "Insights into the removal of Cr(VI) from aqueous solution using plant-mediated biosynthesis of iron nanoparticles" . | Environmental Technology and Innovation 23 (2021) . |
APA | Hao, Runqin , Li, Dong , Zhang, Jie . Insights into the removal of Cr(VI) from aqueous solution using plant-mediated biosynthesis of iron nanoparticles . | Environmental Technology and Innovation , 2021 , 23 . |
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摘要 :
The inhibition of the on/off aeration time ratio on nitrite oxidizing bacteria (NOBs) in intermittent aeration is the key to accumulating nitrite. This study explores the stable operation of nitrosated granular sludge under the same frequency of aeration and different combinations of stop exposure time. At 25-28, aerobic granular sludge was inoculated into a sequencing batch reactor (SBR) (R0) and acclimatized to nitrosated granular sludge by intermittent aeration and dissolved oxygen (DO) restriction. The effects of different on/off aeration time ratios in one sub-aeration cycle (3 min:3 min; 4 min:2 min; 2 min:4 min) on the performance of nitrosated granular sludge were analyzed using three same sets of SBRs (R1, R2, and R3). Experiments showed that the nitrite accumulation rates of R1 and R2 were higher, with average nitrite accumulation rates of 89% and 95%, respectively. The nitrosation performance of R3 was poor, and the nitrite accumulation rate at the end of the operation cycle was only 57%. The results showed that when the off-aeration time was between 2 and 4 minutes, the longer the off-aeration time was, the more stable the granular sludge structure was; hence, a good nitrosation performance could be maintained. When the off aeration time was less than 2 minutes, the alternation of anaerobic and aerobic environment could not be fully realized, which resulted in the sludge tending to stay in an environment of continuous aeration. Thus, the environmental advantage of intermittent aeration was lost; the NOBs could not be inhibited, and the granular sludge was disintegrated thereby leading to the deterioration of the nitrosation performance. Additionally, the longer aeration time contributed to the development of irregularly shaped particles. The longer the off-aeration time was, the higher the PN/PS value was, which was beneficial to the enhancement of the hydrophobicity of the particle surface and the sludge settling performance. © 2020, Science Press. All right reserved.
关键词 :
Bacteria Bacteria Batch reactors Batch reactors Deterioration Deterioration Dissolved oxygen Dissolved oxygen Granular materials Granular materials Nitration Nitration
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GB/T 7714 | Zhang, Jie , Lao, Hui-Mei , Li, Dong et al. Effect of On/Off Aeration Time Ratio Under High Frequency On/Off Aeration on Performance of Nitrosated Granular Sludge [J]. | Environmental Science , 2020 , 41 (1) : 360-367 . |
MLA | Zhang, Jie et al. "Effect of On/Off Aeration Time Ratio Under High Frequency On/Off Aeration on Performance of Nitrosated Granular Sludge" . | Environmental Science 41 . 1 (2020) : 360-367 . |
APA | Zhang, Jie , Lao, Hui-Mei , Li, Dong , Wei, Zi-Qing . Effect of On/Off Aeration Time Ratio Under High Frequency On/Off Aeration on Performance of Nitrosated Granular Sludge . | Environmental Science , 2020 , 41 (1) , 360-367 . |
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摘要 :
Aeration intensity is an important parameter to control intermittent aeration DO. To clarify the effects of same total aeration intensities and different aeration intensities on the intermittent aeration SBR nitrosation process, activated sludge with good nitration abilities was inoculated in reactors at 25-28 . Effect of aeration intensity under intermittent aeration on the stability of nitrosation system was studied using response surface analysis in an intermittent aeration SBR reactor. Results show that the controlled aeration intensity of 1.2 L/(h · L) could inhibit the activity of NOB, where the nitrite nitrogen accumulation rate could reach 93%, while the ammonia nitrogen removal rate was only 80%. When the aeration intensity was increased to 1.58 L/(h · L), the nitrosation performance was deteriorated with the increase of the operating cycle. When the aeration intensity was 1.93 L/(h · L), and the ammonia oxidation rate and nitrite accumulation rate were 90% and 91.6%, higher ammonia oxygen removal and nitrite accumulation were achieved. Batch experiments and response surface analysis showed that aeration intensity and aeration time had significant effects on ammonia nitrogen removal and nitrite accumulation. The shorter the aeration time was, the higher the nitrite accumulation rate would be achieved, and the higher the aeration intensity was, the higher the ammonia nitrogen removal efficiencies would be achieved. However, the activity of AOB was suppressed under low aeration intensity, and the high ammonia nitrogen removal efficiency could not be maintained by prolonging the aeration time. Under high aeration intensity, the activity of AOB could not be enhanced accordingly. The ammonia nitrogen removal rate and the nitrite accumulation rate were only affected by the aeration time. Therefore, under the same total aeration intensities, higher aeration intensity should be adopted with the combination of short aeration time to achieve high ammonia nitrogen removal and nitrite accumulation. Copyright ©2020 Journal of Harbin Institute of Technology.All rights reserved.
关键词 :
Activated sludge process Activated sludge process Ammonia Ammonia Efficiency Efficiency Nitration Nitration Nitrogen removal Nitrogen removal Surface analysis Surface analysis Surface properties Surface properties
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GB/T 7714 | Zhang, Jie , Lao, Huimei , Li, Dong et al. A study of the effect of aeration intensity on nitrosation process operated in SBRs [J]. | Journal of Harbin Institute of Technology , 2020 , 52 (11) : 1-9 . |
MLA | Zhang, Jie et al. "A study of the effect of aeration intensity on nitrosation process operated in SBRs" . | Journal of Harbin Institute of Technology 52 . 11 (2020) : 1-9 . |
APA | Zhang, Jie , Lao, Huimei , Li, Dong , Wei, Ziqing . A study of the effect of aeration intensity on nitrosation process operated in SBRs . | Journal of Harbin Institute of Technology , 2020 , 52 (11) , 1-9 . |
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摘要 :
SBR reactors R1 and R2 were used to inoculate activated sludge from a sewage treatment plant, and domestic sewage was used as the influent. The operation was carried out using a single and multiple influent-aeration operation strategy, respectively, and the particle size change and removal effect during the operation was studied. The results show that R1 and R2 successfully achieved sludge granulation after 56 days and 39 days of operation, respectively. The concentrations (mg•L-1) of chemical oxygen demand, total nitrogen, and total phosphorus (TP) in the effluent of R1 and R2 after stable operation were 29.7, 13.7, 0.31, 19.2, 8.1, and 0.37, respectively. The removal rates were respectively 87.7%, 75.6%, 95.1%, and 90.1%, 85.6%, and 94.2%, and the average particle size of the particles reached 740 μm for R1 and 791 μm for R2. The results showed that for the same running time, the effluent NO3--N concentration and TP concentration in R2 were lower than those in R1. In the later stage of operation, the ratio of denitrifying phosphorus-accumulating organisms (DPAO) to total phosphorus-accumulating organisms (PAOs) in R1 and R2 increased from an initial 11.17% to 25.47% and 34.08%, respectively. Compared with the one influent-aeration operation strategy, the multiple influent-aeration operation strategy had a lower concentration of NO3--N in the initial stage of the startup, the PAOs received less impact, the DPAO enrichment was better, the phosphorus removal performance was better, and it helped to form aerobic granular sludge. © 2020, Science Press. All right reserved.
关键词 :
Activated sludge process Activated sludge process Chemical oxygen demand Chemical oxygen demand Effluents Effluents Granular materials Granular materials Nitrogen removal Nitrogen removal Particle size Particle size Phosphorus Phosphorus Sewage Sewage Sewage aeration Sewage aeration Sewage treatment plants Sewage treatment plants
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GB/T 7714 | Zhang, Jie , Wang, Yu-Ying , Li, Dong et al. Aerobic Granular Sludge System with Multiple Influent-Aeration Operation Strategy [J]. | Environmental Science , 2020 , 41 (3) : 1409-1417 . |
MLA | Zhang, Jie et al. "Aerobic Granular Sludge System with Multiple Influent-Aeration Operation Strategy" . | Environmental Science 41 . 3 (2020) : 1409-1417 . |
APA | Zhang, Jie , Wang, Yu-Ying , Li, Dong , Liu, Zhi-Cheng , Cao, Si-Yu . Aerobic Granular Sludge System with Multiple Influent-Aeration Operation Strategy . | Environmental Science , 2020 , 41 (3) , 1409-1417 . |
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摘要 :
To explore the removal route of ammonia nitrogen, a biological purification process operation test for high concentration of iron and manganese associated ammonia nitrogen [Fe() 9.2-15.1 mg/L, Mn() 0.6-1.4 mg/L, NH4+-N 0.9-2.0 mg/L] was carried out at low temperature (5-6 ) in a groundwater plant for iron, manganese, and ammonia nitrogen removal. Results show that the filter column had good removal effect of ammonia nitrogen at the initial stage of start-up. The analysis along the process and the adsorption test of mature filter material and backwash sludge show that when the influent ammonia nitrogen was about 1.1 mg/L, the ammonia nitrogen was mainly removed by the iron and manganese oxides in the upper part of the filter layer, and the removal rate by biological action was very small. In order to further explore the biological and adsorption effects of filter column on ammonia nitrogen, gradient was used to adjust the concentration of ammonia nitrogen in influent. With the increase of the influent ammonia nitrogen concentration, the ammonia nitrogen removal by biological action increased. Under the condition of influent iron and manganese concentration, the ammonia nitrogen removal by iron and manganese oxides adsorption was about 1 mg/L in the upper 20 cm range of the filter. © 2020, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.
关键词 :
Adsorption Adsorption Ammonia Ammonia Chemicals removal (water treatment) Chemicals removal (water treatment) Groundwater Groundwater Iron oxides Iron oxides Manganese oxide Manganese oxide Nitrogen removal Nitrogen removal Purification Purification Temperature Temperature
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GB/T 7714 | Zhang, Jie , Mei, Ning , Li, Dong et al. Removal route of ammonia nitrogen in purification process of low temperature groundwater containing high concentration of iron and manganese associated ammonia nitrogen [J]. | Journal of Harbin Institute of Technology , 2020 , 52 (6) : 85-93 . |
MLA | Zhang, Jie et al. "Removal route of ammonia nitrogen in purification process of low temperature groundwater containing high concentration of iron and manganese associated ammonia nitrogen" . | Journal of Harbin Institute of Technology 52 . 6 (2020) : 85-93 . |
APA | Zhang, Jie , Mei, Ning , Li, Dong , Liu, Menghao , Wang, Liuyu , Yang, Hang . Removal route of ammonia nitrogen in purification process of low temperature groundwater containing high concentration of iron and manganese associated ammonia nitrogen . | Journal of Harbin Institute of Technology , 2020 , 52 (6) , 85-93 . |
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摘要 :
The process of starting AAOB granular sludge under low temperature substrate (NH4+-N, NO2--N (4010) mg/L) was investigated. In this study, SBR reactor was used to gradually shorten the experimental cycle to start AAOB granular sludge, and the nitrogen removal rate and nitrogen load of the system were analyzed for the kinetic characteristics of anaerobic ammonium oxidation process at each stage. Meanwhile, the granular sludge morphology, average particle size, EPS content, and three-dimensional fluorescence characteristics of EPS were analyzed. Results showed that the experimental period was shortened (24 h12 h10 h8 h), and the nitrogen load increased from 0.074 g/(Ld) to 0.204 g/(Ld). The Grau second-orders model better characterized the process of starting AAOB granular sludge. The matrix removal rate constant k2 increased from 0.15 to 0.22, and the denitrification performance was gradually improved. The MLSS and MLVSS of the sludge were finally stabilized from 2 989 and 2 348 mg/L to 2 460 and 1 776 mg/L. As the reaction went on, the anaerobic ammonium oxide sludge fully utilized the matrix, and the granular sludge was gradually stabilized. The average particle size of the particles reached 410 μm. The PN content and the PN/PS value first increased and then tended to be stable, and they became larger as the particle size increased. The three-dimensional fluorescence component in the sludge EPS was analyzed by the PARAFAC method, which was composed of NADH, riboflavin, and humic acid. Copyright ©2020 Journal of Harbin Institute of Technology.All rights reserved.
关键词 :
Fluorescence Fluorescence Granular materials Granular materials Morphology Morphology Nitrogen removal Nitrogen removal Particle size Particle size Particle size analysis Particle size analysis Rate constants Rate constants Temperature Temperature Wastewater treatment Wastewater treatment
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GB/T 7714 | Li, Dong , Cao, Zhengmei , Zhang, Jie et al. Performance analysis of AAOB granular sludge started at room temperature and low substrate [J]. | Journal of Harbin Institute of Technology , 2020 , 52 (11) : 10-17 . |
MLA | Li, Dong et al. "Performance analysis of AAOB granular sludge started at room temperature and low substrate" . | Journal of Harbin Institute of Technology 52 . 11 (2020) : 10-17 . |
APA | Li, Dong , Cao, Zhengmei , Zhang, Jie , Gao, Xuejian , Zhang, Shirui . Performance analysis of AAOB granular sludge started at room temperature and low substrate . | Journal of Harbin Institute of Technology , 2020 , 52 (11) , 10-17 . |
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